﻿jQuery.fn.pngfixer = function (settings) {
    settings = jQuery.extend({
        imgs: true,
        backgrounds: true,
        shim: 'images/blank.gif',
        apply_positioning: true
    }, settings);

    return this.each(function () {
        if (jQuery.browser.msie && parseInt(jQuery.browser.version, 10) < 7 && parseInt(jQuery.browser.version, 10) > 4) {
            jQuery(this).find('*').andSelf().each(function (i, obj) {
                var self = jQuery(obj);
                // background pngs
                if (settings.backgrounds && self.css('background-image').match(/\.png/i) !== null) {
                    var bg = self.css('background-image');
                    var src = bg.substring(5, bg.length - 2);
                    var mode = (self.css('background-repeat') == 'no-repeat' ? 'crop' : 'scale');
                    var styles = {
                        'filter': "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + src + "', sizingMethod='" + mode + "')",
                        'background-image': 'url(' + settings.shim + ')'
                    };
                    self.css(styles);
                };
                // image elements
                if (settings.imgs && self.is('img[src$=png]')) {
                    var styles = {
                        'width': self.width() + 'px',
                        'height': self.height() + 'px',
                        'filter': "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + self.attr('src') + "', sizingMethod='scale')"
                    };
                    self.css(styles).attr('src', settings.shim);
                };
                // apply position to 'active' elements
                if (settings.apply_positioning && self.is('a, input') && (self.css('position') === '' || self.css('position') == 'static')) {
                    self.css('position', 'relative');
                };
            });
        };
    });
};